Hitachi Chigusa serves the god Takemikazuchi as a member of his Familia. Her medium-length black hair typically obscures her face, though glimpses reveal dark green eyes. She wears bandages around her neck and left upper leg, complemented by a lavender kimono secured at the waist with red cloth; her sole visible armor is a red thigh piece on her left leg.

Chigusa possesses a timid and reserved personality, often appearing shy. Yet, she demonstrates fierce loyalty to her Familia, particularly its captain, Kashima Ouka, for whom she nurtures deep romantic feelings. Her high concentration capacity and attentiveness significantly bolster her combat effectiveness.

Trained personally by Takemikazuchi, Chigusa is a skilled martial artist proficient in multiple fighting styles. She masters various weapons, excelling especially with the bow—surpassing even Yamato Mikoto in archery. Her aptitude for seamless teamwork enhances her coordination with Familia members. Further training in stealth and infiltration leverages her intense focus for covert operations.

As a Level 2 adventurer, Chigusa's physical capabilities far surpass ordinary humans and exponentially exceed Level 1 adventurers. Her senses sharpened significantly after receiving her Falna and leveling up. Her Development Ability, "Abnormal Resistance," nullifies effects like poison. A signature technique is "Shukuchi Zettou, Copo de Nieve de Tundra—Técnica del Regalo del Dios de la Guerra—Técnica Secreta, Sombra de Nieve," a high-speed movement skill involving rapid closure of distance followed by a four-strike attack.

Chigusa operates within the Takemikazuchi Familia alongside Ouka and Asuka. Her surname, "Hitachi," references the ancient Japanese province tied to Takemikazuchi's mythological descent. Her alias alludes to the Jian bird from Chinese mythology—a creature symbolizing eternal bonds due to its dependence on a partner for flight, mirroring her devotion to Ouka.